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Finding the Fourth Proportional to 285.11, 393.35 and 243.26

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Solution

The fourth proportional to 285.11, 393.35 and 243.26 is: 335.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.11 : 393.35 = 243.26 : x
  2. Step 2: Convert to fraction form
    285.11/393.35 = 243.26/x
  3. Step 3: Cross multiply
    285.11x = 393.35 × 243.26
  4. Step 4: Simplify right side
    285.11x = 95,686.32
  5. Step 5: Solve for x
    x = 95,686.32/285.11
  6. Step 6: Final answer
    x = 335.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.